On Monday, I wrote a post about canning in vintage jars. Tara left a comment, asking about the safety of these jars. I briefly responded to her question there, but it’s an important enough question that I wanted to make sure that the query and my answer to it got its moment in the sun.
So here it goes. These jars are not recommended by the USDA. The only home canning method endorsed by the USDA is the one that involves Ball/Kerr/Mason jars and the two-part lids. Thing is, Weck jars aren’t endorsed either and they are widely sold today and are an extremely popular style of canning jar in Europe. These vintage bailing wire jars are the functional equivalent of the Weck jars. That fact leads me to extrapolate that if you treat the vintage jars with the same safety precautions that are recommended for the Weck jars (those safety precautions come from the Weck company, not from the USDA) and check the seal after canning by lifting the jar by the lid, your canned item will be just fine. As an added precaution, I only plan on using these vintage jars to can high sugar items like jams and jellies.
The thing to remember is that the government safety precautions are written for the absolute canning novice. They want to make the canning process as safe and idiot-proof as possible. And they’re right to do so, because people have gotten sick from eating poorly canned/preserved foods. While I wouldn’t recommend that you can in vintage jars during your very first canning session, I do think that it’s a viable option as you explore and want to try other styles of jars.
However, just because I’ve offered instructions on how to do this style of canning, I do not intend to endorse other antiquated styles of food preservation. I’m not going to start sealing jars with paraffin wax (despite my father’s happy memories of licking his grandmother’s jam off of wax discs). But I will continue to can in these bailing wire glass jars, using fresh rubber seals and following safe canning procedures (making sure my jars are clean and undamaged, doing the hot water process and then testing the strength/quality of the seal once the jars are cool by lifting the jar by the lid). I like the way they look, I like how sturdy they are and I like that the only waste produced is the rubber seal. All that said, don’t do it if it makes you uncomfortable.